{%MainUnit qtint.pp}

function IsOldKDEInstallation: Boolean;
var
  Display: PDisplay;
  i: longint;
begin
  //if we are under KDE4, it's already recent one.
  Result := not ((GetEnvironmentVariable('KDE_SESSION_VERSION') = '4')
    or QX11Info_isCompositingManagerRunning);
  if Result then
    exit;

  //if we are under other WM KDE_SESSION_VERSION does not exist
  //so we must check for XOrg version.
  Display := QX11Info_display();
  i := XVendorRelease(Display);

  //X, XOrg between 5.0 - 7.04 are old ones and contains KDE-3.5
  //Fedora marks XOrg 7.XX as 1.XX, so we have to check that too.
  Result := ((i >= 50000000) and (i <= 70040000)) or
    ((i > 0) and (i <= 10400000));
end;

function IsCurrentDesktop(AWidget: QWidgetH): Boolean;
var
  Display: PDisplay;
  ScreenNum: Integer;
  RootWin: TWindow;
  WMAtom: TAtom;

  typeReturned: TAtom;
  formatReturned: Integer;
  nitemsReturned: PtrInt;
  unused: PtrInt;
  WidgetIndex, DesktopIndex: Pointer;
  WidgetWin: TWindow;
begin
  Result := True;
  if AWidget = nil then
    exit;
  Display := QX11Info_display();
  if Display = nil then
    exit;
  ScreenNum := QX11Info_appScreen();
  RootWin := XRootWindow(Display, ScreenNum);
  WMAtom := XInternAtom(Display,'_NET_WM_DESKTOP', True);
  WidgetWin := TWindow(QWidget_winId(AWidget));

  if (WMAtom > 0) and (WidgetWin <> 0) then
  begin
    WidgetIndex := nil;
    DesktopIndex := nil;
    // first get our desktop num (virtual desktop !)
    if XGetWindowProperty(Display, WidgetWin, WMAtom, 0, 4, False, XA_CARDINAL,
         @typeReturned, @formatReturned, @nitemsReturned,
         @unused, @WidgetIndex) = Success then
      begin
        if (typeReturned = XA_CARDINAL) and (formatReturned = 32) and
          (WidgetIndex <> nil) then
        begin
          // now get current active desktop index
          WMAtom := XInternAtom(Display,'_NET_CURRENT_DESKTOP', True);
          if XGetWindowProperty(Display, RootWin, WMAtom, 0, 4, False,
            XA_CARDINAL, @typeReturned, @formatReturned, @nitemsReturned,
            @unused, @DesktopIndex) = Success then
          begin
            if (typeReturned = XA_CARDINAL) and (formatReturned = 32) and
              (DesktopIndex <> nil) then
              Result := PtrUint(WidgetIndex^) = PtrUint(DesktopIndex^);
          end;
        end;

        if WidgetIndex <> nil then
          XFree(WidgetIndex);
        if DesktopIndex <> nil then
          XFree(DesktopIndex);
        WidgetIndex := nil;
        DesktopIndex := nil;
    end;
  end;
end;

function X11Raise(AHandle: HWND): boolean;
var
   Display: PDisplay;
   RootWin: TWindow;
   ScreenNum: Integer;
   XClient: TXClientMessageEvent;
   WMAtom: TAtom;
begin
  Result := False;
  Display := QX11Info_display();

  if Display = nil then
    exit;

  ScreenNum := QX11Info_appScreen();
  RootWin := XRootWindow(Display, ScreenNum);

  XClient._type := ClientMessage;
  XClient.window := AHandle;
  WMAtom := XInternAtom(Display,'_NET_ACTIVE_WINDOW', False);
  XClient.message_type := WMATom;
  XClient.format := 32;
  XClient.data.l[0] := 1;
  XClient.data.l[1] := CurrentTime; // _NET_WM_USER_TIME
  XClient.data.l[2] := 0;
  Result := XSendEvent(Display, RootWin, False,
	      SubstructureRedirectMask or SubstructureNotifyMask,
	      @XClient) <> Success;
end;

function X11GetActivewindow: QWidgetH;
var
  Display: PDisplay;
  RootWin: TWindow;
  ScreenNum: Integer;
  WMAtom: TAtom;
  ActualTypeReturn: TAtom;
  ActualFormatReturn: LongInt;
  NItemsReturn, BytesAfterReturn: Cardinal;
  Ptr: Pointer;
  Valid: Boolean;
begin
  Result := nil;
  Display := QX11Info_display();

  if Display = nil then
    exit;
  Ptr := nil;
  ScreenNum := QX11Info_appScreen();
  RootWin := XRootWindow(Display, ScreenNum);
  WMAtom := XInternAtom(Display,'_NET_ACTIVE_WINDOW', False);
  Valid := XGetWindowProperty(Display, RootWin, WMAtom, 0, 1, False,
                                 AnyPropertyType, @ActualTypeReturn,
                                 @ActualFormatReturn, @NItemsReturn,
                                 @BytesAfterReturn, @Ptr) = Success;
  if Valid and (Ptr <> nil) and (ActualTypeReturn = XA_WINDOW) and
    (ActualFormatReturn = 32) then
  begin
    RootWin := TWindow(Ptr^);
    try
     Result := QWidget_find(RootWin);
    finally
      XFree(Ptr);
    end;
  end else
  if Assigned(Ptr) then
    XFree(Ptr);
end;

function GetWindowManager: String;
{used to get window manager name, so we can handle different wm's behaviour
 eg. kde vs. gnome}
var
  Display: PDisplay;
  ScreenNum: Integer;
  RootWin: TWindow;
  WMAtom: TAtom;
  WMWindow: TWindow;

  typeReturned: TAtom;
  formatReturned: Integer;
  nitemsReturned: PtrInt;
  unused: PtrInt;
  data: Pointer;
begin
  Result := '';
  Display := QX11Info_display();

  if Display = nil then
    exit;

  ScreenNum := QX11Info_appScreen();
  RootWin := XRootWindow(Display, ScreenNum);
  WMAtom := XInternAtom(Display,'_NET_WM_DESKTOP', True);

  if WMAtom > 0 then
  begin
    WMAtom := XInternAtom(Display,'_NET_SUPPORTING_WM_CHECK', False);
    if WMAtom > 0 then
    begin
      data := nil;
      WMWindow := 0;
      if XGetWindowProperty(Display, RootWin, WMAtom, 0, 1024, False, XA_WINDOW,
        @typeReturned, @formatReturned, @nitemsReturned,
        @unused, @data) = Success then
        begin
          if (typeReturned = XA_WINDOW) and (formatReturned = 32) and
            (Data <> nil) then
          begin
            // this is our window manager window
            WMWindow := TWindow(Data^);
            XFree(Data);
            Data := nil;
          end;
          if WMWindow = 0 then
            exit;
          WMAtom := XInternAtom(Display,'UTF8_STRING', False);
          if XGetWindowProperty(Display, WMWindow,
            XInternAtom(Display,'_NET_WM_NAME', False), 0, 1024, False,
            WMAtom, @typeReturned, @formatReturned, @nitemsReturned,
            @unused, @data) = Success then
          begin
            if (typeReturned = WMAtom) and (formatReturned = 8) then
              Result := StrPas(Data);
            if Data <> nil then
              XFree(Data);
            Data := nil;
          end;
       end;
    end;
  end;
end;

procedure SetSkipX11Taskbar(Widget: QWidgetH; const ASkipTaskBar: Boolean);
const
  _NET_WM_STATE_REMOVE = 0;
  _NET_WM_STATE_ADD = 1;
  {_NET_WM_STATE_TOGGLE = 2;}
var
   Display: PDisplay;
   RootWin: TWindow;
   ScreenNum: Integer;
   XClient: TXClientMessageEvent;
   WMAtom: TAtom;
begin
  Display := QX11Info_display();

  if Display = nil then
    exit;
  ScreenNum := QX11Info_appScreen();
  RootWin := XRootWindow(Display, ScreenNum);

  // _NET_WM_STATE_SKIP_TASKBAR
  XClient.format := 0; // shutup compiler
  FillChar(XClient, SizeOf(XClient), 0);
  XClient._type := ClientMessage;
  XClient.window := QWidget_winId(Widget);
  WMAtom := XInternAtom(Display,'_NET_WM_STATE', False);
  XClient.message_type := WMAtom;
  XClient.format := 32;

  if ASkipTaskBar then
    Xclient.data.l[0] := _NET_WM_STATE_ADD
  else
    Xclient.data.l[0] := _NET_WM_STATE_REMOVE;
  WMAtom := XInternAtom(Display,'_NET_WM_STATE_SKIP_TASKBAR', True);
  Xclient.data.l[1] := WMAtom;
  Xclient.data.l[2] := 0;
  Xclient.data.l[3] := 0;
  Xclient.data.l[4] := 0;
  XSendEvent (Display, RootWin, False,
	      SubstructureRedirectMask or SubstructureNotifyMask,
	      @Xclient);
end;

function GetAlwaysOnTopX11(Widget: QWidgetH): boolean;
var
  Display: PDisplay;
  X11Window: TWindow;
  WMAtom: TAtom;
  typeReturned: TAtom;
  formatReturned: Integer;
  nitemsReturned: PtrInt;
  unused: PtrInt;
  data: Pointer;
begin
  Result := False;
  Display := QX11Info_display();

  if Display = nil then
    exit;

  X11Window := TWindow(QWidget_winId(Widget));
  if X11Window = 0 then
    exit;

  WMAtom := XInternAtom(Display,'_NET_WM_STATE', False);
  if WMAtom > 0 then
  begin
    data := nil;
    if XGetWindowProperty(Display, X11Window, WMAtom, 0, 1024, False, XA_ATOM,
      @typeReturned, @formatReturned, @nitemsReturned,
      @unused, @data) = Success then
    begin
      if (typeReturned = XA_ATOM) and (formatReturned = 32) and
        (Data <> nil) then
      begin
        while nitemsReturned > 0 do
        begin
          // make happy ancient x11 or old kde ?
          if XInternAtom(Display,'_NET_WM_STATE_STAYS_ON_TOP', False) = TAtom(Data^) then
            Result := True
          else
          if XInternAtom(Display,'_NET_WM_STATE_ABOVE', False) = TAtom(Data^) then
            Result := True;
          dec(nItemsReturned);
          if Result or (nItemsReturned = 0) then
            break;
          inc(Data);
        end;
        if nitemsReturned > 0 then
          XFree(Data);
        Data := nil;
      end;
    end;
  end;
end;

function GetKeyLockState(const AKey: Byte): Boolean;
var
  Display: PDisplay;
  n: Cardinal;
begin
  Result := False;
  Display := QX11Info_display();

  if (Display = nil) then
    exit;

  if (XkbGetIndicatorState(Display, XkbUseCoreKbd, @n) = Success) then
  begin
    if (AKey = VK_LCL_CAPSLOCK) then
      Result := (n and $01) = 1
    else
    if (AKey = VK_NUMLOCK) then
      Result := (n and $02) = 2;
  end;
end;

